He roamed the halls shrouded in mystery. He never interacted with anyone, and came and went as he liked. Nobody knew who he was, but amounted every misfortune to his misdeeds. Classes were disrupted, students were targets of practical jokes; even Peeves could not have created such chaos. This mysterious entity had his demands, and was obeyed by students and professors alike. The ghosts would have nothing to do with him; they claimed that they had never seen something so horrible in their lifetime, and death-time. He came to be known as the Phantom of Hogwarts.